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<p>[QUOTE="springfld.arsenal, post: 191680, member: 54"]Verry good, DF! Yes, mikes they are, almost free so I didn't even check to see if they work or are accurate. They are easily calibrated anyway. </p><p><br /></p><p>The three things looking like gear reducers are Ettco tapping machines. The tapered shaft fits into a drill press spindle with matching 2MT taper, then a screw- thread tap of the size you need clamps into the lower spindle of the Ettco thing. The machine runs clockwise with the drill press until the tap is through the hole being tapped, then reverses itself to screw the tap back out of the hole. If you've ever hand-tapped a hole in metal (very time-consuming!) you know why these machines exist.[/QUOTE]</p><p><br /></p>
[QUOTE="springfld.arsenal, post: 191680, member: 54"]Verry good, DF! Yes, mikes they are, almost free so I didn't even check to see if they work or are accurate. They are easily calibrated anyway. The three things looking like gear reducers are Ettco tapping machines. The tapered shaft fits into a drill press spindle with matching 2MT taper, then a screw- thread tap of the size you need clamps into the lower spindle of the Ettco thing. The machine runs clockwise with the drill press until the tap is through the hole being tapped, then reverses itself to screw the tap back out of the hole. If you've ever hand-tapped a hole in metal (very time-consuming!) you know why these machines exist.[/QUOTE]
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